Installation methods and debugging of the screw conveyor

2. The assembly of the casing shall comply with the following provisions:

(1) The allowable deviation of the longitudinal straightness is 1/1000 of the length, and the allowable deviation of the overall length straightness is 3mm.

(2) The allowable deviation of the transverse straightness is 1/5000 of the width.

(3) The clearances on both sides between the inner wall of the casing and the screw should be equal, with an allowable deviation of 2mm, and the allowable deviation of the bottom clearance is ±2mm.

(4) The joints of the casing should be closely fitted without any gaps.

(5) The casing and the frame should be padded firmly.

3. The allowable deviation of the coincidence degree between the axis of the shaft or bearing and the longitudinal axis of the screw conveyor is 0.5mm.

4. The inner surfaces of two adjacent casings should not have obvious misalignment at the joints.

5. Each section of the screw conveyor should be adjusted properly before tightening the anchor bolts.

6. The low - speed shaft of the drive device and the front shaft of the screw conveyor should be on the same axis. If a floating coupling is used, the parallelism deviation should not exceed 1/100, and the displacement deviation should not exceed 0.2mm; if a coupling is used, the angular error between the two axes should not exceed 1°30′.

7. If the inlet and outlet need to be installed on - site, they should be welded after the whole machine is fixed. The flange support surface of the inlet and outlet should be parallel to the axis of the screw conveyor, and the connection with the funnel should be closely fitted without any gaps.

Adjustment of the screw conveyor:

1. Each hanging bearing of the screw conveyor should reliably support the connecting shaft, preventing the screw from being stuck or bent. During installation, the number of gaskets of the hanging bearing should be adjusted so that there is no gap between the split surfaces of the bearing, while there is an appropriate radial gap between the bearing and the connecting shaft.

2. The hanging bearing should be installed at the mid - point of the connecting shaft. The clearance between its end face and the end face of the two screw tube shafts should be greater than 10mm (when the screw diameter D ≤ 400mm) and 20mm (when the screw diameter D ≥ 500mm) respectively.

3. In order to adjust the cumulative error of the length between the casing and the screw, it is allowed to add woven asbestos tape between the flanges of each casing during installation. Whether to add waterproof canvas between the casing and the cover can be determined according to the sealing requirements.

4. When the center height of the low - speed shaft of the drive device reducer and the center height of the screw conveyor differ too much, the height of the drive device can be adjusted by using gaskets.

5. During no - load test run, if oil leakage is found in the bearing, the bearing should be removed and the tightness of the spring in the seal ring should be adjusted until there is no oil leakage.

6. During no - load test run, if the temperature rise of the hanging bearing is too high (during no - load test run, the temperature rise of each bearing should not exceed 20℃; during load test run, the temperature rise of each bearing should not exceed 30℃), it indicates that the position of the hanging bearing is improperly installed, causing the connecting shaft to be stuck. The fastening bolts should be loosened and the position of the hanging bearing should be adjusted.